In a poetry slam, members of the audience are chosen by an M.C. or host to act as judges for the event. After each poet performs, each judge awards a score to that poem. Scores generally range between zero and ten. The highest and lowest score are dropped, giving each performance a rating between zero and thirty points. In the standard slam, there are five judges.
Before the competition begins, the host will often bring up a "sacrificial poet," which the judges will score in order to calibrate their judging.
A single round at a slam consists of performances by all eligible poets. Most slams last multiple rounds, and many involve the elimination of lower-scoring poets in successive rounds. A standard elimination rubric might run 8-4-2, with eight poets in the first round, four in the second, and two in the last. Some slams do not eliminate poets at all.
Props, costumes, and music are generally forbidden in slams. Additionally, most slams enforce a time limit of three minutes (and a grace period of ten seconds), after which a poet's score may be docked according to how long the poem exceeded the limit.